Researchers from Microsoft and the University of Washington have jointly created a system that allows users to use gestures to stimulate the computer to perform commands such as page scrolling and simulated mouse double-clicking, without the need for any hardware other than the microphone and speakers that are standard on the computer.
This system is based on the well-known Doppler effect: when a train whistling a siren passes an observer, he will find that the tone of the siren changes from high to low, because the level of the tone is determined by the difference in the frequency of the sound wave vibration. The sound wave frequency is high, the tone sounds high, otherwise it sounds low, this phenomenon is the Doppler effect. In the new system, engineers recorded changes in the frequency of tones produced by computer microphones and speakers as objects such as the palm of a hand waved past. The software called "Sonic" analyzes the corresponding frequencies and converts them into computer commands, which can also be applied to smartphones.
So far, the research team has captured five basic variables related to frequency changes: speed, direction, proximity, object size and time changes. By capturing and measuring these variables when making gestures in front of the computer, "sound wave" can complete page scrolling up and down, identify mouse clicks and double clicks, and other continuous actions, and can move objects forward and backward through the hands Rotate and so on. Therefore, the system can support users to operate Tetris games only with gestures, and can wake up users when they are close to the computer and put them to sleep when they leave.
It can be seen that the research team positioned the "sound wave" as an expansion device for the computer, so that it can be used as a complement to somatosensory systems supported by cameras and sensors such as Microsoft Kinect. Researchers have conducted software tests based on many different brands and types of computers, and found that the basic functions of the software can be achieved without adjusting existing hardware, and the execution accuracy of all commands can reach 90%. In addition, they also tested through multiple users in different environments, including noisy cafes, etc., and found that the software works well in all situations.
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